Surface Roughness of a Polymer Film Above and Below the Glass Transition Temperature
ORAL
Abstract
The roughness of a polymer film is controlled by thermally activated capillary waves and it decreases with temperature.
At a temperature TF close to the glass transition temperature (Tg), some studies suggest that the surface roughness ``freezes in'' and stops decreasing with temperature.
Using Molecular Dynamics (MD) simulations, we simulate a coarse-grained model of a thin polymer at various temperatures above and below Tg.
We extract the surface roughness using an algorithm that mimics Atomic Force Microscopy experiments and we investigate the relationship between TF and Tg and whether and how the structure of the polymer film changes above and below Tg.
At a temperature TF close to the glass transition temperature (Tg), some studies suggest that the surface roughness ``freezes in'' and stops decreasing with temperature.
Using Molecular Dynamics (MD) simulations, we simulate a coarse-grained model of a thin polymer at various temperatures above and below Tg.
We extract the surface roughness using an algorithm that mimics Atomic Force Microscopy experiments and we investigate the relationship between TF and Tg and whether and how the structure of the polymer film changes above and below Tg.
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Presenters
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Mauro Lorenzo Mugnai
Georgetown University
Authors
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Mauro Lorenzo Mugnai
Georgetown University
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Jonathan Seppala
National Institute of Standards and Technology
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Peter D Olmsted
Georgetown University